/* Source file https://github.com/MrOtherGuy/firefox-csshacks/tree/master/chrome/selected_tab_gradient_border.css made available under Mozilla Public License v. 2.0
See the above repository for updates as well as full license text. */

/* Adds a gradient outline to selected tab. This is going to need modifications if you use tabs that don't follow Proton styling. */

.tab-background[selected]{
  outline: none !important;
  border: 2px solid transparent !important;
  box-shadow: none !important;
  background-clip: padding-box;
}
.tab-background[selected] > .tab-context-line{ margin: -5px 0 0 !important; }
.tabbrowser-tab[selected] > .tab-stack::before{
  content: "";
  display: flex;
  min-height: inherit;
  border-radius: var(--tab-border-radius);
  grid-area: 1/1;
  margin-block: var(--tab-block-margin);
  /* Edit gradient colors here */
  background: repeat linear-gradient(90deg,#f0f,#ff0,#0ff)!important;
}